版本4 “超新星爆炸”，记得的两道题有：文中第二段提到了1%(one percent)， 是什么目的，回到文中定位，应该是说作者在第二段中讨论的现象是比较独特的，存在于 Golbal Cluster (星团)，在 normal binary system (双子星)中并不常见。 还有一个问题是问中子星从周围吸收物质后，发生了什么变化。答案应该是选“spin more quickly, and become pulsar again."还有文中的这句话：由于碎物一般寿命很短，所以诞生于碎物种的A同学都是很年轻的。是一个考点。 版本5 第一段讲超新星爆炸如何如何变为白矮星（就是能量耗尽了），这个过程产生了很多东西，形成新的星，一部分生命物质和全部的氧 都来自这个过程。第二段讲原先科学家一直都不知道这个过程如何产生的。现在知道了，然后详细解释了一番，先是在自己重力下缩得很小，然后核变开始，大量能 量把物质冲出去。 1．以下哪个不是supervalor 产生的；选B，其它都可在原文中找到A New star B Mass star C part of human D dust E 氧气 2．早期天文学家对超新星的认识过程与下面哪个类似（知其然不如其所以然） 选某生物学家知道某种病毒可以感染细胞，但不知具体过程 相关文章1：http://en.wikipedia.org/wiki/Supernova 相关文章2：A supernova is an exploding star that can become billions of times as bright as the sun before gradually fading from view. At its maximum brightness, the exploded star may outshine an entire galaxy. The explosion throws a large cloud of dust and gas into space. The mass of the expelled material may exceed 10 times the mass of the sun. Astronomers recognize two types of supernovae -- Type I and Type II. Type I supernovae probably occur in certain binary双子星 stars. A binary star is a pair of stars that are close together and orbit about each other. A Type I probably occurs in binaries in which one of the stars is a small, dense star called a white dwarf. If the two stars are close enough to each other, the gravitational pull of the white dwarf draws mass from the larger companion. When the white dwarf reaches a mass about 1.4 times that of the sun, it collapses瘪 and then explodes. A Type II supernova results from the death of a single star much more massive than the sun. When such a star begins to burn out, its core quickly collapses. Tremendous energy is suddenly released in the form of neutrinos中微子 (a type of subatomic亚原子的（比原子小） particle) and electromagnetic radiation (electric and magnetic energy). This energy causes the star to erupt into a supernova. Most supernovae reach maximum brightness a few days after they occur and shine intensely for several weeks. Some fade within months. Others fade over a period of years. Supernovae also differ in the amount and composition of the material that they expel. Supernovae can also leave behind different types of objects. After some supernova explosions, there remains a small, dense star composed mainly of neutrons or perhaps of elementary particles called quarks. Such a star is called a neutron star. Rapidly rotating, highly magnetized neutron stars are called pulsars. After other explosions, an invisible object called a black hole may be left behind. A black hole has such powerful gravitational force that not even light can escape it. In some cases, no object of any kind remains after a supernova explosion. Scientists believe that supernovae created all the heavier elements, such as iron, gold, and uranium, that are found on earth and have been detected in objects outside the solar system. Also, there is evidence that some high-energy cosmic宇宙的 rays originate in supernovae. In 1054, Chinese astronomers recorded a supernova so bright that it was visible during the day. The explosion left behind a pulsar and a huge cloud of gas and dust known as the Crab Nebula, which still can be seen today. In 1987, a Type II supernova became visible in the Large Magellanic Cloud, the galaxy closest to the Milky Way. It was the first supernova to be visible to the naked eye in almost 400 years. It could be viewed only from the Southern Hemisphere. 记得百度知道一下“超新星”和“白矮星”的中文内容
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发表于 2011-7-5 14:10:14
